Lucy
Ask the AI Tutor
Need help with Endothermic and Exothermic Reactions 2? Ask our AI Tutor!
Lucy AI Tutor - Lucy
Connecting with Tutor...
Please wait while we establish connection
Lucy
Hi! I'm Lucy, your AI tutor. How can I help you with Endothermic and Exothermic Reactions 2 today?
now
0/50 words
  1. Home
  2. GCSE
  3. Chemistry
  4. Endothermic and Exothermic Reactions 2
Logo

Chemistry Quiz - Endothermic and Exothermic Reactions 2 (Questions)

Endothermic and exothermic reactions also link to reversible reactions and equilibrium. This GCSE Chemistry quiz helps you predict how temperature changes affect the position of equilibrium.

Explore the Topic →
(quiz starts below)

Fascinating Fact:

Reversible reactions can be exothermic in one direction and endothermic in the other. Changing temperature can shift the position of equilibrium.

In GCSE Chemistry, reversible reactions reach a dynamic equilibrium in a closed system when forward and reverse reactions happen at the same rate. Temperature changes can favour the endothermic or exothermic direction, shifting the equilibrium position and changing the amounts of reactants and products.

Key Terms

  • Reversible Reaction: A reaction where products can react to form the original reactants, shown with a double arrow.
  • Dynamic Equilibrium: When forward and reverse reactions occur at the same rate, so overall amounts stay constant in a closed system.
  • Closed System: A setup where reactants and products cannot enter or leave, allowing equilibrium to be established.

Frequently Asked Questions

How does temperature affect equilibrium in GCSE Chemistry?

Temperature affects equilibrium by favouring the endothermic direction when temperature increases and favouring the exothermic direction when temperature decreases, shifting the equilibrium position.

What does dynamic equilibrium mean in a reversible reaction?

Dynamic equilibrium means the forward and reverse reactions continue happening, but at the same rate, so the concentrations of reactants and products stay constant in a closed system.

Why do reversible reactions need a closed system to reach equilibrium?

A closed system is needed because if products escape or reactants enter, the concentrations keep changing, so the forward and reverse reaction rates cannot balance to form equilibrium.

Try These Related Quizzes

1. Bond breaking is an...
[ ] endothermic process
[ ] exothermic process
[ ] exciting process
[ ] eltothermic process
2. Bond making is an...
[ ] endothermic process
[ ] exothermic process
[ ] exciting process
[ ] eltothermic process
3. Electrolysis requires energy to make it work. This means it is...
[ ] an endothermic reaction
[ ] an exothermic reaction
[ ] an eltothermic reaction
[ ] a chemical reaction
4. Thermal decomposition is...
[ ] an exothermic reaction
[ ] an endothermic reaction
[ ] a common reaction
[ ] an energy rich reaction
5. Neutralisation is...
[ ] an endothermic reaction
[ ] a physical reaction
[ ] an exothermic reaction
[ ] an oxidation reaction
6. On an energy level diagram, the products of an exothermic reaction will be...
[ ] higher than the reactants
[ ] the same level as the reactants
[ ] on a different diagram to the reactants
[ ] lower than the reactants
7. Pick the correct combination of information for an exothermic reaction.
[ ] °C ↑ ΔH +ve
[ ] °C ↑ ΔH -ve
[ ] °C ↓ ΔH +ve
[ ] °C ↓ ΔH -ve
8. ΔH is the energy change for the reaction. To calculate this...
[ ] add the reactants' energy to the products' energy
[ ] subtract the reactants' energy from the products' energy
[ ] divide the reactants' energy by the products' energy
[ ] subtract the products' energy from the reactants' energy
9. Which of the following observations indicate an endothermic reaction?
[ ] The temperature of the decaying grass in the compost maker was considerably above the outside temperature
[ ] Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
[ ] The mixture bubbled vigorously and the temperature dropped by 40°C
[ ] A red glow spread through the mixture and the temperature increased by 10°C
10. If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?
[ ] There are equal amounts of energy required to break and make the bonds in the reaction
[ ] There is a lot of energy used for both making and breaking bonds
[ ] There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
[ ] There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products

You can find more about this topic by visiting BBC Bitesize - Exothermic and endothermic reactions

© Education Quizzes. Please visit www.educationquizzes.com to subscribe
Logo
Chemistry Quiz - Endothermic and Exothermic Reactions 2 (Answers)
1. Bond breaking is an...
[x] endothermic process
[ ] exothermic process
[ ] exciting process
[ ] eltothermic process
Energy is required to break bonds
2. Bond making is an...
[ ] endothermic process
[x] exothermic process
[ ] exciting process
[ ] eltothermic process
Energy is given out when bonds are formed
3. Electrolysis requires energy to make it work. This means it is...
[x] an endothermic reaction
[ ] an exothermic reaction
[ ] an eltothermic reaction
[ ] a chemical reaction
Electrolysis requires a supply of electrical energy from a DC circuit
4. Thermal decomposition is...
[ ] an exothermic reaction
[x] an endothermic reaction
[ ] a common reaction
[ ] an energy rich reaction
Thermal decomposition requires heat energy to break substances down
5. Neutralisation is...
[ ] an endothermic reaction
[ ] a physical reaction
[x] an exothermic reaction
[ ] an oxidation reaction
The temperature of the products of a neutralisation reaction is higher than the temperature of the reactants
6. On an energy level diagram, the products of an exothermic reaction will be...
[ ] higher than the reactants
[ ] the same level as the reactants
[ ] on a different diagram to the reactants
[x] lower than the reactants
This shows us that the products have less energy than the reactants, because energy has been transferred to the surroundings
7. Pick the correct combination of information for an exothermic reaction.
[ ] °C ↑ ΔH +ve
[x] °C ↑ ΔH -ve
[ ] °C ↓ ΔH +ve
[ ] °C ↓ ΔH -ve
ÄH is the symbol used to represent the energy change
8. ΔH is the energy change for the reaction. To calculate this...
[ ] add the reactants' energy to the products' energy
[x] subtract the reactants' energy from the products' energy
[ ] divide the reactants' energy by the products' energy
[ ] subtract the products' energy from the reactants' energy
Products - reactants is +ve for endothermic reactions and -ve for exothermic reactions
9. Which of the following observations indicate an endothermic reaction?
[ ] The temperature of the decaying grass in the compost maker was considerably above the outside temperature
[ ] Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
[x] The mixture bubbled vigorously and the temperature dropped by 40°C
[ ] A red glow spread through the mixture and the temperature increased by 10°C
It is not so much the bubbling that shows this is endothermic, that can happen in exothermic reactions, but rather the temperature drop. That indicates that heat energy has been lost from the reacting mixture
10. If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?
[ ] There are equal amounts of energy required to break and make the bonds in the reaction
[ ] There is a lot of energy used for both making and breaking bonds
[ ] There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
[x] There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products
Remember, energy changes in chemical reactions are all about bond breaking and bond making
© Education Quizzes. Please visit www.educationquizzes.com to subscribe